Support new audiocore+audioio modules

In CircuitPython 4.1.x the audiio module got split into audioio and
audiocore modules, so now we need to import both to support sound.

Author: hexthat

stage.py

@@ -1,6 +1,7 @@
 import time
 import array
 import digitalio
+import audiocore
 import audioio
 import _stage
 
@@ -163,7 +164,7 @@ def play(self, audio_file, loop=False):
         played in the background.
         """
         self.stop()
-        wave = audioio.WaveFile(audio_file)
+        wave = audiocore.WaveFile(audio_file)
         self.audio.play(wave, loop=loop)
 
     def stop(self):